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Investments - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) equipment engine aircraft.	Mar. 31, 2021 USD ($) equipment	Dec. 31, 2021 USD ($)
Equipment Held For Operating Lease
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 1,951,448		$ 1,991,368
WMES
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Number of engines in lease portfolio | engine	37
Number of aircraft in lease portfolio | aircraft.	5
WMES | Aircraft
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 281,100
CASC Willis
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Number of engines in lease portfolio | engine	4
Number of assets sold | equipment	0	0
CASC Willis | Equipment Held For Operating Lease
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 48,500
Other Income | WMES | Asset Management
Schedule of Equity Method Investments [Line Items]
Other sales and revenues	$ 500	$ 300

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